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. 2017 Aug 22;18:160. doi: 10.1186/s12931-017-0642-6

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© The Author(s). 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Analyses of survival indicates that ex-smokers revealed shorter survival time (36 months) than current smokers (52 months (0.029)) or non-smokers (55 months (p=0.034))